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sand87ch's avatar
sand87ch
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Dec 05, 2022

BigIP F5 LTM fails during Load testing

My Set up has a BIGIP single CPU hosted on AWS.This sits in front of a node API i use for load testing. Now when i send a 1K_1krpm request..i.e., 5000 requests in 5 mins to my node api via the BIG I...
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Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Dec 07, 2022

This means that your F5 is sending to much RST-Response because someone tried to access a non-existing service port on your F5. 

Err Msg: 011e0001:4: Limiting open port RST response from 501 to 500 packets/sec (f5.com)

The only explanation for this would be, that your Pool got marked down so that your VS will be  marked down too and your test still tries to access your VS (causing the system to send reset responses).

Can you please verify if your pool became unhealthy during your tests?

Cheers, Kai

Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Dec 07, 2022

Sorry...

The log lines you send where complaining about "Limiting open port RST" and not "Limiting closed port RST" (both messages exist) 

The "Limiting open port RST" happens if the F5 receives a "Non-SYN" packet on a open port, but does not have a related connection for it. This may happen with legitimate traffic if network issues interrupting bidirectional communication...

Heath_Parrott pointed out "Connection Table" limits in AWS. Those may be a good explanation for the interrupted communication you see in your logs. Did you already clarified with AWS?

Cheers, Kai